A duct with a square cross$-$section $(20$ cm x $20$ cm$)$ covers electrical wires and located at a

place with $61\mathrm{.}6$ kPa atmospheric pressure. A cooling air at $30\backslash$deg C flows over the duct to keep

the surface temperature at $65\backslash$deg C$.$ The velocity of the air is $200$ m$/$min and the length of the

duct is $1\mathrm{.}5$ m$.$ Calculate the total power of the electrical wires.